We already detailed the preemptive request Atlus has made via Twitter about posting Catherine spoiler videos.

Here's what someone else has to say on the matter:

Sheep dude, the straight talker who serves as your guide in the game and at the official site, says, "Hello. I'm Sheep. Do you know of this scary rumor? Those who share spoilers about Catherine will have nightmares and die. Scary, scary. Everyone, to avoid nightmares, let's not post spoilers."

Sheep dude seems to be particularly concerned about spoilers from the game's 8th night and beyond.